ValueError:closures文件的I / O操作
import csv with open('v.csv', 'w') as csvfile: cwriter = csv.writer(csvfile, delimiter=' ', quotechar='|', quoting=csv.QUOTE_MINIMAL) for w, c in p.iteritems(): cwriter.writerow(w + c)
这里, p
是字典, w
和c
都是string。
当我尝试写入文件时,报告错误:
ValueError : I/O operation on closed file.
帮助我,我真的是新的python。 我正在使用Python 2.7.3预先感谢您。
正确缩进; for
声明应该在块内:
import csv with open('v.csv', 'w') as csvfile: cwriter = csv.writer(csvfile, delimiter=' ', quotechar='|', quoting=csv.QUOTE_MINIMAL) for w, c in p.iteritems(): cwriter.writerow(w + c)
在with
block之外,文件被closures。
>>> with open('/tmp/1', 'w') as f: ... print f.closed ... False >>> print f.closed True